Dr. William Bayer, MD

Dr. William Bayer, MD

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Endocrinology, Diabetes & Metabolism  |  
Male  |  
57 y/o
(24)

Accepting new patients

Dr. William Bayer, MD is an endocrinology, diabetes & metabolism doctor who practices in Carol Stream, IL. He is 57 years old and has been practicing for 32 years.

Northwestern Medicine Regional Medical Group

501 Thornhill Dr

Carol Stream, IL 60188
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Accepted insurance

  • Aetna
  • Blue Cross Blue Shield of Illinois
  • Cigna
  • Cigna-HealthSpring
  • CorVel
  • Coventry Health Care
  • First Health (Coventry Health Care)
  • HealthLink
  • HFN
  • Humana
  • LifeSynch
  • Medicaid
  • MultiPlan
  • UniCare

Learn about Dr. Bayer

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you

Top Care Areas

new

See how frequently Dr. Bayer performs your care needs compared to other doctors.

Thyroid Cancer
very high
more than 99% of peers
Diabetes With Renal Manifestations
very high
more than 99% of peers
Hypothyroidism
very high
more than 99% of peers

Dr. Bayer's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

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Care Philosophy

This content was provided by Dr. Bayer ""Better people means better experiences. Our care team is committed to delivering results that change lives." "
2

Specialties

  • Endocrinology, Diabetes & Metabolism
  • Internal Medicine
2

Board Certifications

  • Diabetes, Metabolism & Endocrinology
    Accredited by: American Board of Internal Medicine*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*
51

Conditions Treated

  • Abnormal Thyroid
  • Acromegaly and Gigantism
  • Adrenal Gland Diseases
  • Adrenal Incidentaloma
  • Adrenal Insufficiency
  • Autoimmune Diseases
  • Autoimmune Thyroid Diseases
  • Benign Tumor
  • Bone Disorders
  • Breast Diseases
  • Calcium Metabolism Disorders
  • Cancer
  • Congenital Adrenal Hyperplasia (CAH)
  • Cushing's Syndrome
  • Diabetes Insipidus
  • Diabetes Type 1
  • Diabetes Type 2
  • Diabetes With Renal Manifestations
  • Diabetic Ketoacidosis
  • Female Infertility
  • Goiter
  • Graves' Disease
  • Growth Hormone Deficiency
  • Gynecomastia
  • Hashimoto's Disease
  • Hypercalcemia
  • Hyperkalemia
  • Hyperlipidemia
  • Hyperparathyroidism
  • Hyperthyroidism
  • Hypoglycemia
  • Hypokalemia
  • Hypoparathyroidism
  • Hypopituitarism
  • Hyposmolality and Hyponatremia
  • Hypothyroidism
  • Kidney Disease
  • Lipid Disorders
  • Malaise and Fatigue
  • Multiple Endocrine Neoplasia
  • Obesity
  • Osteopenia
  • Osteoporosis
  • Overweight
  • Symptomatic Menopause
  • Testicular Dysfunction
  • Thyroid Cancer
  • Thyroid Cyst
  • Thyroid Disease
  • Thyroiditis
  • Vitamin D Deficiency

More

Read More
2

Procedures

  • Continuous Glucose Monitoring
  • Diabetes Counseling

Background Check

0 Malpractice Claims

No malpractice history found for Illinois.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.

Education

  • Loyola University of Chicago / Stritch School of Medicine
    Medical School | Graduated 1986
  • Loyola University Medical Center
    Internship Hospital | Completed
  • Loyola University Medical Center
    Residency Hospital | Completed
  • Loyola University Medical Center
    Fellowship Hospital | Completed

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Bayer has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Bayer does not have any memberships or affiliations listed. If you are Dr. Bayer and would like to add memberships or affiliations, please update your profile.

Dr. Bayer's Reviews

Likelihood of recommending Dr. Bayer to family and friends
3.3
based on 24 total reviews (10 with comments)

Likelihood to Recommend (24)

  • 5
    (13)
  • 4
    (0)
  • 3
    (1)
  • 2
    (1)
  • 1
    (9)

Dr. Bayer's Performance

Trustworthiness
VERY GOOD
Explains condition(s) well
VERY GOOD
Answers Questions
GOOD
Time well spent
VERY GOOD

Office & Staff Performance

Scheduling
VERY GOOD
Office environment
VERY GOOD
Staff friendliness
VERY GOOD
Average wait time
16 to 30 minutes

Patient Comments (10)

in St. Charles IL. |
Dr. Bayer is a Diabetic Endocrinologist that I have complete trust in has really turned my A1C Goal/Goals to the Positive. He is very knowledgeable in his field and he always spends appropriate time w/patient/patients. I will be 62 in December and have been battling Diabetes since 1999/2000. He has...more
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in ELK GROVE VILLAGE |
Do not take the bad reviews seriously! Dr. Bayeris amazing & caring! So, if you need a really good doctor that cares about your health & does not set a timer when you walk in, he is your answer to getting your health back on track! I came to him when there was no one else. He cared & I am now on...more
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Hoffman Estates, IL |
Dr Bayer is a no-nonsense doctor that is very knowledgable and thoruough. I have gone to him for many years before a car accident and am now able to see him again. I could not find his phone number so I looked it up. As I read the reveiws that were positive, I could relate. As I read the...more
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in Aurora, IL |
He needs to retire. He's clearly mad at everything, he was 30 minutes late to an 8:00 am meeting and told me out of the gate he already didn't know what to do. He took no time to listen and understand. he's terrible, go somewhere else
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Wheaton, IL |
One of the worst doctors I have ever seen. Rude, disrespectful, and just plain mean. He doesn't care about patients and this was shown by his horrible bedside manner. He needs training on how to be nice to people.
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Now Accepting New Patients
Dr. Bayer accepts 16 insurance carriers
  • Aetna
    Aetna EPO
    Aetna POS
    Aetna PPO
    Managed Choice POS
    Open Choice PPO
  • Blue Cross Blue Shield of Illinois
    Blue Advantage
    Blue Cross Blue Shield of Illinois HMO
    Blue Cross Blue Shield of Illinois PPO
    Blue Precision HMO
  • Cigna
    Great West Healthcare-Cigna HMO
    Great West Healthcare-Cigna POS
    Great West Healthcare-Cigna PPO
  • Cigna-HealthSpring
  • CorVel
    Worker's Compensation WC
  • Coventry Health Care
    Coventry Health Care HMO
    Coventry Health Care POS
    Coventry Health Care PPO
  • First Health (Coventry Health Care)
  • HealthLink
    HealthLink HMO
    HealthLink POS
    HealthLink PPO
  • HFN
    HFN PPO
    Worker's Compensation WC
  • Humana
    Choice
    Choice Care
    Choice PPO
    Humana HMO
    Humana POS
    Humana PPO
  • LifeSynch
    Behavioral Health
  • Medicaid
  • MultiPlan
    MultiPlan PPO
    PHCS Network PPO
  • UniCare
    UniCare HMO
    UniCare POS
    UniCare PPO
  • UnitedHealthCare
    Choice
    Choice Plus
    United Behavioral Health
    United Healthcare EPO
    United Healthcare HMO
    United Healthcare POS
    United Healthcare PPO
  • Viant

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Bayer has admitting privileges

Northwestern Medicine Central DuPage Hospital
25 N Winfield Rd
Winfield, IL 60190
View Hospital Profile

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